Valve



R. J. PRATT su J. ROBISGN.

VALVE. i

Patente-d Dec. 1Y0, 1889.`

' UNITED STATES PATENT OFFICE.

RoRERT J. PRATT AND JosEPi-rRoBIsoN,4 QEGREENBUS'H, 'NEWs-oRn.

VALVE.`

SPECIFICATION formngpart of Letters Patent No. 416,948, dated December 10,' '18895 Application am August s1, 183e. serai No. 284,219.' un model.)

To all whom it may cobcern:

in Valves; and we do hereby declare the fol- `distributing system.

lowing to bea fulhleaigandexact descriptiO..

ofthe invention, such as will enable others skilled in the art to which it appertains to make'and use the same.

Our yinvention relates to means for controlling automatically or manually the flow. ot the motive and attemperating iiuid within the main andbranch pipes or conduits f a lt is especially designed for regulating automatically or otherv wise the supply of steam from' the main con-` duit of a steam-heating system to the radiators thereof, and in one of the forms illustrated ispartic'nlarlyv serviceable in connection with'the steam-heating system shown in the application filed September 12, i888, Serial No. 285,227, by Robert J. Pratt as sole inventor, and wherein communication between the main steanrsupply conduit and any particular radiator is automatically estab lished or cut off and at the same time aby-pass opened to the remaining radiators of the system by means of a compound valve governed by oppositely-act-ing magnetic devices, whose battery-circuits are under the control of cir'- cuit-closing thermostats having double contracts and located within th e rooms to'be heated. lt will be apparent, however, that our iinprovements may be embodied in other systems of steam-heating, and indeed are generally applicable to-all systems wherein an attefmperating-uid is employed furthe purpose of regulating temperature-as, for instance, in 'heating by air or expansive gases, hot water, and other `liquids, or in cooling by th'e' circulation of brine, ammonia, ether, and the like-and whether the valve mechanism is to be operated automatically bya thermostat or manually at the will of the operator.

Theprincipal object of our invention is to decrease as much as possible the resistance 'opposed by thevalve mechanism to the actuating force determining 'its moven1ents-a matter of the utmost importance where said actuating force is that of magnetic attracprovements will be principally employed.

wherein a balanced supply-valve is governed by-a supplemental balanced slide-valve controlling the flow ot the otive fluid actuating V,said.supplyfyalve, thesiupplementalvalve being moved by astein or xrod adapted to be controlled either manually 'or by opposing electro-magnets, Iand in the latter case requiring a battery-current of comparatively7 small prpmptly and effectively.

' n the accompanying drawings, illustrative of our invention, Figure lrepresents in section a steam-pipe coupling constructed and invention, and Fig. `2""r`epresents a like view of a modification thereof.

Similar iigures of reference indicate similar parts throughoutf the several views.

dicates a steam-pipe coupling or fitting, having screw-threaded coupling-extensions l 2 3, for the .reception of the' threaded ends of steam-conveying pipes. Goupling-extension l is designed to communicate with the supply-pipe from a steam-boiler or its equivanect, respectively, with the by-pass pipe and with the co'il or other radiator, as is more fully set forth..in-.the application for Letters Patent of Robert J. Pratt', hereinbefore referred to.

the openings 2 and 3 is regulated by means of a compound valve having a guide-stem 4, provided with the conical valves 5 6, having conresponding sea-ts 7 8, as shown, in the interior of the'iitting, and theValve-stem, it desired, having a guide 36 intermediate ybetween said seats. At its outer end the valvestem is provided with a piston-head 9, ot' larger area than eith er valve and worlringwithin a chamber l0, forming `a portion of the fit-l ting, said piston being suitably' packed, and the valve-stem passing through a st-uing-box chamber 10 and the pipe system, except XVe have devised an arrangement ofA parts' power and tritling expense to operate it lent, and the extensions are designed to con- The flow of steam from the supply-pipe 'toV l1, which'cuts off' communication between the tion, as in the construction wherein our' imarranged in' accordance with one form of our `Referring-to Fig. 2 of ythe drawings, A in- A IOO through ports l2 13, communicating with the chamberlel, which opens freely into the steam to leave one of the ports 12 13 constantly in supply conduit by .means of the passage 15, which may, as shown, be readily formed in the Wall of the iitting.

Within the chamber l14 is locateda piston slide-valve having a longitudinal opening 16 and governing the ports 12' 13. The saidl slide-valve is provided with a stem 17, passing througha suitable stuing-box 18, the said valve being normally in such position as of port 13, the hollow interior lofthc valve,

and the passage-way '15, leading to the coupling-branch 1, the port 12 at the same time opening Ainto the exhaust 20. Simultaneously the valve 5 is lifted from its seat 7 and'commu'nication established between'the main steamsupply pipe and the pipe connected with the coupling-branch 2. The said valve may now be readily operated '(either manually or automatically by means of. a magnet whose battery circuit is controlled by a thermostat) so as to connect the pipe 13 with the exhaust 2,0 and connect 4the port12 with the main steam-supply pipethrough the passage 15. The'eiect of this movement of the Vslide-valve will be to cause the piston 9 to move to the opposite end of the chamber 10,

, thereby opening the valve 6 and closing the valve 5.

the passage 3 being the saine upon eachof the valve-disks, and ang, back-pressure from eitheri or 5- being fully compensated for and overcome by the large .area of the piston 9. YThe slide-valve governing thel ports to .the main piston-chamber 10 is also balanced, so that the smallest amount of force is necessary to move said slide-valve, while the action of the piston attached to the main valve is almost instantaneous.

In the form of our invention illustrated in Fig. lvthe main characteristics of that just described are preserved. The fitting Bin this instance, however, is provided with but two coupling-branches 2l 22,and is interposed directlyin the main supply-conduit. The valve 23 is provided. with a'stem 24, .passing through a stuffing-box 25, and hasconnected with it a piston-head 26, operating within vthe pistonchamber 27. The piston-chambcr, as in the former instance, communicates by means of 'opened or closed.

The compound valve 5 6, it will be, noted, is a balanced valve, the pressure from,

ports 2829 witli'a chaimber 30, containing a hollow lslide-valve 31, said chamber 30 having an exhaust-port 32 andcom'municating by a passage-way 33 with the main steam-supply pipe. y

The reciprocation of the va'lve 31 within the chamber 30 is effected by means of pivoted arm 34,-having a steam-tight globe-bearing within the Wall of the fitting, as shown. The projecting arm 35 of the valve-stein constitutes the actuating portion ofthe reciprocatf ing valve and corresponds to the piston-stem 17. (Illustrated in Fig. 2.) For convenience of illustrationwe have shown this arln as provided with a handle for operating it by hand, although it will be apparentthat the said arm may constitute the armature of two oppositely-disposed electro-magnets adapted to move it in one direction or the other, according as the corresponding magnet is actuated.

From what has been said with regard to Fig. .2 the operation of the construction shown in Fig. 2 will be apparent. Y The reciprocation of the slide-valve 31 opens successively, as desired, communication between the ports 28 `29 and the passage 33 and exhaust-port 32,

according as the main supply-valve is to be Having thus described our invention, what 1. The combination, with an attemperatl ingfluid conduit provided withl a pistonchamber and a balan ced. valve located therein,

Vsaid valve being provided with a piston-head Y.

working within the piston-chagnber, an auxiliary duid-chamber connected with the main fluid-supply and the piston-chamber by suit# able ports or passagesand having an exhaustport, and a balanced slide-valve governing said ports and having an actuating-rod, -said slide-valve being located Within said aux, iliary chamber, substantially as described.-

2. rlChe combination, with an attexnperating-fluid conduit provided with a piston chamber and a balanced valve, said valve being provided with 'ar piston-head working within-the piston-chamber, an auxiliary fluidchamber connected with the main'iluid-sup-` ply and the piston-chamber by suitable ports IOO IIO

or passages and having an exhaust-port, and

a balanced slide-valve governing said ports and having a longitudinal Aopening and an actuating-rod, said slide-valve being located Within said auxiliary chamber, substantially as described.

In testimony whereoi:` we aix our signatures in presence of two witnesses. I

ROBERT J. PRATT. JOSEPH ROBISON.

lVit-nesses: FD. K. CURTIS, BENJ. F. ALLEN. 

